GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
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Subject Code:2150404
Subject Name:Principles of Process Engineering-11
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the following terms with respect to tray towers: (i) Flooding (ii) Priming (iii) Coning 03
(b) Differentiate between packed tower v/s tray tower. 04
(c) Derive equations to calculate rate of steady state diffusion of ‘A’ through non-diffusing ‘B’ and also for steady state equimolal counter diffusion in case of gases. 07
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OR
Q.1 (a) Define: (i) Tie-line (ii) Operating line (iii) Raffinate 03
(b) What are different types of packing. 04
(c) Compare surface renewal and Penetration theories. 07
Q.2 (a) Differentiate between direct and indirect mass transfer operations with examples. 03
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(b) Discuss local and overall mass transfer coefficients. 04
(c) Explain steps to determine minimum liquid to gas ratio for absorbers. 07
OR
Q.2 (a) Explain counter current multiple contact, Shanks system for leaching with neat figure. 03
(b) With neat diagram discuss Venturi Scrubber. 04
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(c) Explain criteria of solvent selection for gas absorption. 07
Q.3 A packed tower is to be designed to absorb sulfur dioxide from air by scrubbing the gas with water. The entering gas is 18.6% SO2 by volume. The water flow is to be 2.3 times the minimum. The air flow rate (SO2 free basis) is 1100 m³/hr. The temperature is 30 °C and the total pressure is 2 atm. The equilibrium data is governed by y=21.8x where y and x are in mole fractions units. Compute the number of overall gas phase transfer units. 07
OR
Q.3 (a) Explain preparation of solids for leaching. 03
(b) Explain material balance for single stage extraction. 04
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(c) Discuss in detail about Film theory for mass transfer coefficient. 07
Q.4 (a) Explain the following terms with respect to tray towers: (i) weeping (ii) dumping (iii) tray spacing 03
(b) Write short note on gas absorption with chemical reaction. 04
(c) Derive equation for material balance for single stage countercurrent leaching. 07
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Date:20/11/2018
Total Marks: 70
Q.5 (a) Explain criteria of solvent selection for extraction. 03
(b) Write short note on Bollman extractor with neat sketch. 07
OR
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Q.5 (a) Explain Fick’s law of diffusion. 03
(b) Explain different components of tray tower. 04
(c) Define liquid extraction giving typical example. Explain equilateral—triangular co-ordinate and the mixture rule. 07
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